Guild Wars 2

Ive tryed this many times now and cant get it, i havent even gone stealth flying nore any sheild. Still cant get it, tryed it solo some times, and in party where im 200% shure i didnt get hit. Ach just goes away in the end of last flying face and nothing happens. Pleace fix this

Tryed it today 2 times, still not working, it just goes, the achevment progress just goes away.

Still noone fixing this….